Fix a helper problem and add a dotdot test regen.

package.json

@@ -33,8 +33,9 @@
     "self-check": "node src-electron/main-process/electron-main.js selfCheck -g ./test/gen-template/zigbee/gen-templates.json",
     "version-stamp": "node src-script/zap-versionstamp.js",
     "gen": "node src-script/zap-generate.js -z ./zcl-builtin/silabs/zcl.json -g ./test/gen-template/zigbee/gen-templates.json -i ./test/resource/three-endpoint-device.zap -o ./tmp",
-    "analyze": "node src-script/zap-start.js analyze -z ./zcl-builtin/silabs/zcl.json -g ./test/gen-template/zigbee/gen-templates.json ./test/resource/three-endpoint-device.zap -o ./tmp",
     "gen2": "node src-script/zap-generate.js -z ./zcl-builtin/silabs/zcl.json -g ./test/gen-template/zigbee/gen-templates.json -i ./test/resource/generation-test-file-1.zap -o ./tmp",
+    "gen3": "node src-script/zap-generate.js -z ./zcl-builtin/dotdot/library.xml -g ./test/gen-template/zigbee/gen-templates.json -i ./test/resource/generation-test-file-1.zap -o ./tmp",
+    "analyze": "node src-script/zap-start.js analyze -z ./zcl-builtin/silabs/zcl.json -g ./test/gen-template/zigbee/gen-templates.json ./test/resource/three-endpoint-device.zap -o ./tmp",
     "genchip": "node src-script/zap-generate.js -z ./zcl-builtin/silabs/zcl.json -g ./test/gen-template/chip/gen-test.json -i ./test/resource/chip/chip_test.zap -o ./tmp",
     "pack": "node src-script/build-spa.js && electron-builder --dir",
     "dist": "electron-builder",

src-electron/generator/helper-zap.js

@@ -170,6 +170,7 @@ function toggle(condition, trueResult, falseResult) {
  * @returns A string with no leading and trailing spaces
  */
 function trim_string(str) {
+  if (str == null) return null
   var result = str.trim()
   return result
 }